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Dynamic Characteristics of a Urea SCR System for NOx Reduction in Diesel Engine

  • Published : 2007.05.31

Abstract

This paper discusses dynamic characteristics of a urea-SCR (Selective Catalytic Reduction) system. The urea flow rate to improve NOx conversion efficiency is generally determined by parameters such as catalyst temperature and space velocity. The urea-SCR system was tested in the various engine operating conditions governing the raw NOx emission levels, space velocity. and SCR catalyst temperature. These experiments include cold-transients to determine catalyst light-off temperature and urea flow rate transients. Likewise. ammonia storage dynamics was also investigated. The cold-transient results indicate the light-off temperature of the catalysts used in these experiments was $200-220^{\circ}C$. The ammonia storage and urea flow rate transients all indicate very slow dynamics (on the order of seconds) which presents control challenges for mobile applications. The results presented in this paper should provide an excellent starting point in developing a functional in-vehicle urea-SCR system.

Keywords

References

  1. Tennison P., Lambert C. and Levin M., 'NOX Control Development with Urea SCR on a Diesel Passenger Car', Society of Automotive Engineers, Inc., 2004, Paper No. 2004 01 1291
  2. Blakeman P. G., Chandler G. R., John G. A. and Wilkins A. J., 'Investigations into NOX Aftertreatment with Urea SCR for Light Duty Diesel Vehicles', Society of Automotive Engineers, Inc., 2004, Paper No. 2001 01 3624
  3. Gieshoff J., Schäfer Sindlinger A., Spurk P. C., Van Den Tillaart J. A. A. and Garr G., 'Improved SCR Systems for Heavy Duty Applications', Society of Automotive Engineers, Inc., 2000, Paper No. 2000 01 0189
  4. Jeong Gil Nam, Joo Yol Choi, Jae Sung Choi, 'Static Characterization of a Urea SCR System for NOx Reduction in Diesel Engine', ISMT 2005 Proceedings, pp.117 124, 2005

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